package cache import ( "encoding/json" "errors" "github.com/beego/memcache" ) // Memcache adapter. type MemcacheCache struct { c *memcache.Connection conninfo string } // create new memcache adapter. func NewMemCache() *MemcacheCache { return &MemcacheCache{} } // get value from memcache. func (rc *MemcacheCache) Get(key string) interface{} { if rc.c == nil { var err error rc.c, err = rc.connectInit() if err != nil { return err } } v, err := rc.c.Get(key) if err != nil { return nil } var contain interface{} if len(v) > 0 { contain = string(v[0].Value) } else { contain = nil } return contain } // put value to memcache. only support string. func (rc *MemcacheCache) Put(key string, val interface{}, timeout int64) error { if rc.c == nil { var err error rc.c, err = rc.connectInit() if err != nil { return err } } v, ok := val.(string) if !ok { return errors.New("val must string") } stored, err := rc.c.Set(key, 0, uint64(timeout), []byte(v)) if err == nil && stored == false { return errors.New("stored fail") } return err } // delete value in memcache. func (rc *MemcacheCache) Delete(key string) error { if rc.c == nil { var err error rc.c, err = rc.connectInit() if err != nil { return err } } _, err := rc.c.Delete(key) return err } // [Not Support] // increase counter. func (rc *MemcacheCache) Incr(key string) error { return errors.New("not support in memcache") } // [Not Support] // decrease counter. func (rc *MemcacheCache) Decr(key string) error { return errors.New("not support in memcache") } // check value exists in memcache. func (rc *MemcacheCache) IsExist(key string) bool { if rc.c == nil { var err error rc.c, err = rc.connectInit() if err != nil { return false } } v, err := rc.c.Get(key) if err != nil { return false } if len(v) == 0 { return false } else { return true } return true } // clear all cached in memcache. func (rc *MemcacheCache) ClearAll() error { if rc.c == nil { var err error rc.c, err = rc.connectInit() if err != nil { return err } } err := rc.c.FlushAll() return err } // start memcache adapter. // config string is like {"conn":"connection info"}. // if connecting error, return. func (rc *MemcacheCache) StartAndGC(config string) error { var cf map[string]string json.Unmarshal([]byte(config), &cf) if _, ok := cf["conn"]; !ok { return errors.New("config has no conn key") } rc.conninfo = cf["conn"] var err error rc.c, err = rc.connectInit() if err != nil { return errors.New("dial tcp conn error") } return nil } // connect to memcache and keep the connection. func (rc *MemcacheCache) connectInit() (*memcache.Connection, error) { c, err := memcache.Connect(rc.conninfo) if err != nil { return nil, err } return c, nil } func init() { Register("memcache", NewMemCache()) }